Printing machine and press



1930. G. (3. H7 WICHMANN I 1,747,963

PRINTING MACHINE AND PRESS Filed March 30, 1928 4 Sheets-Sheet l IIVVf/VTOR eorg 6. Wic/zmarm EEM Haw Feb. 18, 1930. a. c. H. WICHMANN 1,747,963

PRINTING MACHINE AND PRESS Filed March 30. 1928 4 Sheets-Sheet 2 ATTORNEY 1930. G. c. H. WICHMANN 3 PRINTING MACHINE AND PRESS I 'F'iled March 36, 1928 4 Sheets-Sheet s Fig. 6.

(12019017. Wichmam BY MUM 4' Sh eets-Snot 4- .ll-Illllllll' n E mvzzvran Georg CZZ-Wichnmmz er I "roe/v17 "Feb 18, 1930. s. c. H. wIcI-IMANN PRINTING MACHINE AND PRES S Filed March 30. 1928 Patented Feb. 1 8', 1930 PATENT OFFICE GEOBG CARL HEINRICH WICHMANN, OF LONDON, ENGLAND PRINTING- MACHINE AND PRESS Application filed March so, 1928, Serial No. 265,904., and in Great Britain April 14, 1927.

The present invention relates to improvements in cyhnders used in prmting machines OI presses. I

" has to be cast specially, entailing either the I maintenance of a large stock ofdiiferent sizes,

' several views, and. in which Hitherto cast iron cylinders have generally been used for this purpose. Each of these or. delay in the execution of orders. Further such cylinders are heavy, liable to fracture,

and subject to local weaknesses, such'as blowholes and inequalities of thickness, and it is a process of considerable difficulty to true them up.

I havefound that an eflicient cylinder can be constructed ofa rolled metal shell with radial supports, preferably in the form of pressed out or rolled disks, the shell, supports and shafts being united by welding to form an integral structure, and thatgreat advantages arisefrom the use of cylinders so formed, as will be hereinafter more fully described.

Reference is had to the accompanying drawings, in which like parts are indicated by "similar reference symbols throughout the Figure 1 is a side view of a cylinder provide'd with radial spokesyconnected to the shell and shaft by welding, F

- of Figure 1, using a spoke on at; line A construction, I plates or disks to Figure 2 shows a section Figures 3, 4 and 5- show i be used as radial supports in lieu of the spoke along the construction. I Figure 6is an end view of the left hand end of a plate cylinder using radial supports in the form of pressed metal disks. g

Figure 7 is a similar view of the opposite Figure 8 is a plan View showing the com- .plete cylinder ofFigures'G and 7 mountedon its shaft. 3

Referring firstto'Figures 1 and 2, on a shaft or spindle 1, are welded radial supports 2 which are given the formof arms or spiders, and arranged inradial sets. spaced apart shaft, these arms or spiders being of rolled'steel bar or rail welded to the shaft.

' Y The shaft may be of rolled-steel and ofsolicl so e or hollow section.

radial supports to form the set, as the cylinder shell is The cylinder drum is completed by wrapping a rolled steel plate or plates around the cylinder shell or drum wall, and welding the plate or plates to the ends of the arms or spiders, and, if there are several plate sections, to each other.

Where necessary, the gap 8 is left for the reception of the gripping devices or clamping devices, depending on the particular form of cylinder being made. This gap may be conveniently provided by a segmental space left between radial sets of arms or spiders. The faces 4 of the arms or spiders forming the gap walls may be re -inforced by plates welded thereto, or the plate or plates formingthe cylinder shell may be as shown folded over at 5 and welded to the arms or spiders.

Strengthening rings 7 may be Welded or otherwise connected to the radial sets of arms or spiders.

Referring now to Figures 4 to 8, the radial arms 2, of Figures 1 and 2, are'replaced by discs or plates of suitable section, in which gaps are cut if necessary for the insertion of gripping or other devices. Figures 3, 4 and 5 show, respectively, radial supports in the form of pressed steel discs or plates. The numeral 10 represents one of the end plates, 11

der shell or drum wall may be made up of circumferential sectional parts 6, the meeting 0 ends of the multiple parts being welded to a common arm or disc, and the meeting edges being welded to each other. lVith such a method of manufacture the various welding operations can be effected with more ample space for the manipulation of the welding gradually built up. But in any case the usual gapping enables the welding operations to be conveniently performed. p

In all types of printing machine the light ness of the cylinder has a considerable effect on the speed at which the machine can be run, the power needed, and the strength required in the other portions of the machine, whilst in the case of a reciprocating cylinder the question of the weight, and consequently the momentum which has to be reversed at every revolution, is all important. At the approximate wei htof sa a 26 cast-iron'c linden as used on one of the applicants two colour machines, would be about one ton the 1mportance of this can be reahzed. The mven tion therefore enablesiprinting to be carried form,

There is thus produced, for the first time,- a

out at speedsheretofore unattainable.

By the use ofthe presentinvention a cyl-, inder is suppliedat low cost which is at leastlighter than cylinders of the type used in practice, and which has the further and important property of being uniform.

It is impossible to obtain from any foundry 1 a printing cylinder cast in such a manner that the outer walls are uniform 1n thickness throughout the whole of their respective areas, stillless theportions joining the outer Walls tothe axis, and to correct this want of truth, complicated scientific balancing becomes necessary, involvingadditions to the original cylinder, to enable such cylinder to be rotated or recipr cated without undue strain on the machine. The whole process of balancing is costly, involving,inter alia, the

machining of the recessesin which the balance weights are placed.

Further such cast cylinders are heavy, liable to tracture,'and subject to localwe'ak nesses, such as blowholes. Owing to these de-v fects the truing up of cast iron cylinders involves theremoval of up to-3/8a prelim nary process of turning in a lathe being frequently necessary before the ordinary mas chining is started,-whereas with thesteel inders, as in'g, removing about 5/1000 is all thatis necessary.

In the steel cylinders, herein'deseribed, not walls uniform, but the only; are the outer disks or other radial supports, being made out otpressed or roiled steel, are also unirendering balancing "unnecessary.

cylinder capable of use without any extra neous additions.

These, cylinders also have very great strength, and a test has shown that, even when six times the ord nary 'maximum pressures required for printing has been applied to such a cylinder, no deformation whatever can be detected under the most careful tests.

Another very great advantage is that as no casting is involved the cylinders can be made with great rapidity, and it is therefore unnecessary to keep anything like the same stock of different sizes of cylinders as was inecessary under the old system. All thatis cyl-- herein described, a slight mach n-i necessary is to have .asupply of standard sizes of rolled 7 metal.

A cylinder made according to applicants invention can be manufactured in about one a built-up cylinder certain instances, cannot evenas detected in the finished cylinder. I

- All foundry Workh dispensed with, and

the necessity'for making costly patterns is entirely eliminated. V r

Primarily, the very fact of havingtomanutacturesuitable patterns for the preparation of cast iron cylinders isin itself anjextremely expensive item, and taking into consideration the heavy abuse to which these are subjected, with standard foundry practice, the

overhead harges with regard to repairs and renewals of the patterns is an important item. a

The finished weight of rolled, steel cylinders is about half that of cast iron;

Owing to the lighter welght of-steel cylin-- ders,the vibration ordinarily set up in machine when much heavier cast iron cylinders are used, is avoided to a gneat extent; there-j 1 tore, through absence of vibration, machines built with built up weldedsteel cylinders are capableof being run at amuch higher speed than those withcast iron cylinders? 1 Although lighten: cylinders madeof rolled steel are in tact stronger, inasmuch as they are capable of withstanding heavier pressures;

7 Another very important advantage is that the risk of breakage through falls or rough Figuring on the expense of manufacture, I

the producing and finishingot a castcylinder ready for use 'will'cost' say "100units; 7 A

cylinder made'by the herein described inven tion will cost about 60 units;

Again, it the weight of the castcylinder be 100 units, the weight of the welded cylinder 'will beabout '50 units. T

In addition to the saving in thefproduc I10 handling, which is very considerableinthe I case of castings, 1s ellminated.

tion cost there is a saving in cost of freight'age V charges, the saving being due to the difference in the two weights} I j I would have it to term printing .machines in the claimsbe understood. that, the

should beTread 0 as to include printing presses. j

"Whatlclaim is-:"

1. A cylinder for use in printingma'chines drical shape concentric with said shaft, and

radial supports for said shell mounted on said shaft and interposed between said shell and said shaft, said supports being welded to said. shell and also to said shaft to form an integral structure. 3. A cylinder for use in printing machines I icomprising a hollow rolled metal. central shaft, a shell made of comparatively thin rolled metal curved to cylindrical shape conterposed between said shell and said shaft, said supports being welded to said shell and also to said shaft to form an integral structure.

In testimony whereof, I affix my signature.

GEORG CARL HEINRICH WICHMANN.

centric with said shaft, and pressedmetal radial supports for said shell mounted on said shaft and interposed between said shell and said shaft, said supports'being welded to said 'tegral structure.

shell and also to said shaft to form an in- 4. A cylinder for use in printing machines comprising a central rolled metal shaft, a

" shell made ofrolled metalcurved to cylin- .drical shape concentric with said shaft and pressed metal discs, forming radial supports for-said shell mounted on said shaft and interposed betweensaid shell and said shaft,

said supports being welded both to said shell and to said shaft to form an integral structure therewith.

5. A cylinder for use in printing machines comprising a central shaft, ashell made of centric with said shaft,

rolled metal'curved to cylindrical shape con said shell being gapped longitudinally, and provided with reinforcing ribs at each side of the gap, and radial supports for said shell securely mounted on said shaft and interposed between said shell and said shaft, said supports being welded to said shell to form an integral structure therewith. I

6. A cylinder for use in printing machines comprising a central shaft, a shell made of rolled metal curved to cylindrical shape cone centric with said shaft, said shell being gapped longitudinally,

. pressed metal discs forming radial I being welded to said shell to form an structure therewith.

and provided with reinforcing ribs at each side of the gap, and

forsaid shell and said shaft, saidsupports integral 7. A cylinder for use in printing machines comprising a central rolled metal shaft, a shell made of rolled metal curved to cylindrical shape concentric with said shaft, said shell pressed. metal discs being provided with longitudinal gaps with reinforcing ribs at each side of said gaps, and forming radial supports p for said shell mounted on said shaft, and insupports 

